Pulverizer and separator



Patented July 24, 1934 PATENT orrics runvnmznn AND snrana'ron George Holt Fraser, Brooklyn, N. Y.

Originalapplication September 12, 1924, Serial No. 737,413. Divided and this application September l, 1931, Serial No. 560,589

20 Claims.

This application is a division of my original application, filed Sept. 12, 1924, Serial No. 737,413,

proved pulverizing and separating machine.

In pulverizing and separating machines of the type shown in my'Patent No. 1,499,516, dated July 1, 1924, a fixed horizontal die and revoluble and rotatable crushing rolls have been used to pulverize the material in the endless path of a circulating separating current, fine material interceptor means below the die have been disposed "across this path for cleaning fine material from such current, and blower means have'been disposed below the cleaning means for circulating the current up through, out over, down around, and in under, the die, for floating fine material from the latter. a v h In pulverizers of-the type shown in my said 26 original application the horizontal die has been revolubly mounted and driven from below, and the revoluble and rotatable rolls have been driven from'above and have been carried by an impeller mounted in a fixed bearing and have been a0 driven from above, the blower being above the rolls and revolved with them, and a movable and revoluble joint has been provided between the movable die and the cleaning means below it.

My present invention aims to provide improvements-in pulverizing and separating machines especially applicable to those of said types, and aims to improve the operation, and increase the efhciency, simplify the manipulation, and improve the construction, of such devices.

40 life this end in carrying out the preferred form of my present-improvements as applied to a horizontal ring and suspended roll pulverizer, I preferably suspend the ring, and preferably also the roll impeller, from above the plane of revolution of the ring, or the zone in which the material to be separated is distributed, so that each may move radially to absorb vibration, and I preferably revolve both the rolls and the ring, the rolls preferably in one direction and the ring inthe other, so that the centrifugal force ofthe rolls may be used as the crushing force and the centrifugal force of the material may be used to ireep 'it on the inner face of the ring and to return it to the path of the rolls when it is displaced,'-and I preferably revolve one or more of the revoluble parts from above such plane or such zone, preferably by traction and preferably at different and relatively variable speeds, and I preferably provide means for adjusting their respective speeds, or for disconno tinuing drive of either or both, and for utilizing their weight as a traction force for driving'them from overhead. r I

And I preferably provide a vertical or open clearance joint between the cleaning means and 55 the crushing chamber, which joint preferably affords clearance for bothradial and vertical movement;

And I preferably provide a non-rotative feed conduit or pipe withinand encircled by the sus- 10 pension member ormembersby which either or all the crushing elements'are suspended;

And I preferably provide tubular and-concentric suspension members, one within and encircled by another, for suspending the crushing elements,

and extending upwardly from them to their overhead drive means, for driving them from such means; i

And I provide various other features of improvement, all of which will be more fully herego inafter set forth with reference to the accom- ,panying drawing, which is a vertical axial section, partly in elevation, of the preferred adaptation of my invention as a combined suspended roller pulverizer and air separator machine. 35 Referring to the drawing let A indicate a horlzontal ring or die, 13 the rolls, C the driving mechanism, D the feed inlet, and d the fine discharge outlet of a machine for pulverlzing and separating materials.

These parts may be of any suitable construction, arrangement 7 or operation, for pulverizing rock between the annular inner face of the ring and the peripheral outer face of the roll or rolls, for rotating the rolls, or revolving the ring, for supplying material to be pulverized by these faces, and for discharging pulverized material. a As shown the ring A is revoluble and is mounted within and in spaced relation to an outer frame or casing N enclosing an outer chamber k, and the inner annular crushing face of the ring is disposed about a substantially vertical axis and encloses a crushing chamber M having an upa per current outlet d and a lower current inlet 0' communicating with the outer chamber and affording an endless current passage up through, out over, down around, and returning in under, the ring, and this crushing chamber is enclosed above the ring by the inner casing r, and beno low the ring by a bottom wall L, which is flared outwardly and upwardly to receive and return to the crushing face of the ring uncrushed material dropping through the ring. The inner casing has a top wall b spaced from the top wall I of the outer casing and affording between them a fanway m in which the revolving blades of the blower R revolve to cause a separating fluid current to flow up through and out ing hollow outer faces opposed to the direction of flow of such current and affording current voids in which fine particles may precipitate around the return air chamber 1 and around the conical bottom wall v inwardly of and below such filtering means. As shown the outer casing N is closed by a dust cone 2' for receiving such precipitated dust and conducting it to the dust outlet 7'.

The crushing elements are shown as two revoluble and rotatable crushing rolls 'swingingly suspended from a revoluble impeller G, and the material to be crushed is shown as introduced from the feed hopper D through a non-rotary supply conduit U, communicating from without the outer casing concentrically of and to withinthe crushing chamber and discharging on to a revoluble centrifugal distributor T which distributes the material above the crushing rolls.

The inner casing r is shown as provided with a conical lip 0 around the outlet 11, and above and in spaced relation to a partition wall e around the outer edge of which the current must flow from the crushing chamber to the outlet, and the spider G is shownas provided with revolving blades 2 for whirling the current rising through the crushing chamber to centrifugally impel large particles outwardly toward the wall of the inner casing, and with scrapers 1: for scraping adhering particles from such wall, so that such particles may fall into the zone of the crushing elements while finer particles may be floated from the crushing chamber to the outer chamber.

As thus far described these parts may be of any usual or suitable construction or operation, those shown being similar to those set forth in my said original application.

According to one feature of my present invention I suspend the crushing chamber and the die A from above the latter or the distributor T preferably movably within the outer casing, so that it can move horizontally or radially to absorb shocks or vibration, preferably by a tubular dependent suspension member Z2, concentric of and preferably inwardly of the die and mounted above the latter, and movable to permit a slight horizontally swinging movement of the die to absorb vibration incident to crushing. Preferably the suspension member 22 is connected with the bottom wall L, which extends centrally down through and outwardly under the die and on whichthe die is removably mounted.

According to another feature of improvement I preferably revolve the die from overhead and above it and preferably from above the outer casing, preferably by revolving the dependent suspension member 12 by a drive wheel W carrying such member and revolubly mounted on and rotated by a drive roller X, which roller preferably has a tractional driving edge tractionally engaging a tractional under face to the wheel W and is preferably axially adjustable to vary the speed of such wheel, as by being mounted on an axially movable shaft a slidingly mounted in a bearing 1) and moved axially by a lever j, for varying the speed of revolution of the crushing chamber or die to suit such speed of the material being crushed.

Preferably according to another feature of my present improvements, I preferably movably suspend the roll carrier or impeller G from above the crushing chamber, preferably by a tubular depending suspension member S around and spaced from the ring suspension member Z2 and extending concentrically of and up through and above the outer casing and revolubly mounted thereabove, so that it and the die suspender can move relatively radially vibratorily to independently absorb vibrations of the dependent crushing elements carried by them respectively.

As shown the impeller S is carried by a drive wheel Y mounted on a ball bearing m and having a top traction face engaged and driven by the edge traction face of a drive roller Z mounted on a drive shaft c, which is axially movable, as by a lever g, to move the rollers Z radially of the wheel Y to vary the speed of revolution of the crushing rolls to adapt this to the material being crushed.

As shown the shaft a is tubular and the shaft 0 traverses it, and these shafts are feathered together as by a pin d in a slot e. Preferably the impeller suspender S carries and revolves the blades of the blower R, and encircles the die suspender, and both encircle the supply conduit U.

Preferably the outer casing M is below and suspended from an overhead support or main frame Q, above which the impeller and die suspenders are rotatively mounted, and which carries the drive'mechanism.

According to another feature of the present invention I preferably provide vertical and horizontal clearance between the non-rotary filter P and the movable crushing chamber, preferably by spacing the upper ends of the baffles 1 below the bottom wall L of the crushing chamber and inwardly of a guard lip or projection t extended downwardly from such wall, to permit freedom for vertical and radial movement of the die or chamber, as well as its revolution relatively to the filter.

In operation, material to be crushed descending through the supply conduit to the distributor T will be thrown on to the crushing face of the die where it will be'held by centrifugal force until pulverized by the rolls. The revolving fan blades will cause a separating current to flow up through the crushing chamber to float fine material into the outer chamber, and to return under the die through the filter P to clean dust from the returning current as it returns to the inlet 0'. The die or crushing chamber will be suspended vibratorily by its suspension member 12, and the spider G will be suspended vibratorily by its suspender S, so that each can swingingly absorb vibrations incident to their operation. Each will be rotatively mounted and driven above and without the zone of the vortex ring of circulating separating fiuid, and their relative speeds of revolution will be varied as desired.

It will be understood that my invention is not limited to the particular details of construction, arrangement, use, or combination oi parts, set forth as constituting its preferred form, since my improvements can be availed otin whole or'in.

in spaced relation to said outer casing and en-n closing a crushing chamber having an upper current outlet and a lower current inlet in communication with said outer chamber and afford,- ing up through, out. over, down around, andin under, said crushing chamber, an endless current passage, supply means for supplying material to be crushed to said crushing chamber, distribution means within said chamber and below said supply means, iorreceiving and distributing such material across said passage, crushing elements in said crushing chamber for crushing said material, blower means for causing a fluid current to flow through said, passage and up through, out over and down around, said crushing chamber, and to returnin under said crushing chamber, to floatflne material into said outer chamber, support means above the zone of such distribution, torsupporting said revoluble inner casing from above the zone of such distribution, ro-, tary suspension means torsaid revoluble inner casing, revolublymounted on said support means above the zone of such distribution, for revolubly suspending said revoluble inner casing vfrom said support means and Iromabove the zone of such distribution, above the zone of such distribution, revolubly carriedby said support meanstrom above such zone, andinoperative relation to said suspension means above such zone, for rotating said suspension means from above such zone, and by such i suspension means drivingly connected to said revolubleinnerccasing for revolving from above such zonesaidrevoluble inner casing from above said revoluble inner casing.

2. In a pulverizer, an outer casingenclosing' rialto be crushedto said crushing chamber, dis-u tribution means within said chamber and below said supply means, for receiving and distributing such materialin said passage, crushing elements drive means for in said crushing chamber for crushing said material, blower'means for causing a fluid current to flow through'said passage and up, through, out overand down around, said crushing chamber, and to return in under said crushingcchamber, toqfloat flne material into said outer chamber, said revoluble inner casing, in operative relation to and for revolving said crushing chamber, support means for, said revoluble inner casing, above the zoneot such distribution,

and by which said revoluble inner casing is supported, tor supporting said revoluble inner casing from above said zone, and revoluble suspension "means for said revoluble inner casing. revolubly and rotary: overhead drive means,

casingv and mounted on said support means above such zone,

and supportingly connected to said revoluble suspended from said support means, for revolubly suspending said revoluble inner casing from above such zone, and for revolubly suspending said revoluble inner casing within said outer casing.

3. In a pulverizer, an outer casing enclosing an outer chamber, a revoluble inner casing revolving about a substantially vertical axis, within and in spaced relation to said outer casing and enclosing a crushing chamber having an upper current outlet and a lower current inlet communicating with said outer chamber and afiording up through, out over, down around, and in under, said crushing chamber, an endless current passage, supply means for supplying material to be crushed to said crushing chamber, crushing elements in said crushing chamber for crushing said material, blower means for causing a fluid current to flow through said passage and up through, out over and down around, said crushing chamber, and to retum'in under said crushing chamber, tofloat fine material into said outer chamber, drive means in drive engagement with said revoluble inner casing, for revolving said revoluble chamber, flne material interceptor means spaced from said revoluble inner casing and across said passage for cleaning from such current line material floating in said passage, and an open clearancejoint betweensaid revoluble inner casing and said cleaning means, for meat, tating revolution of said revoluble inner casing relatively to said cleaning means.

ing about a substantially vertical axis, within and in spaced relation to said outer casing and en-- closing a crushing chamber having an upper current outlet and a lower current inlet communicating with said outer chamber and affording up through, out over, down around, and in under, said crushing chamber, an endless current passage, supply means for supplying material to be crushed to said crushing chamber, crushing elements in said crushing chamber for crushing said material, blower means tor causing a fluid current to flow through said passage I and up through, out over and down around, said crushing chamber, and to return in under said crushing chamber, to float flne material into said outer chamber, support means by which said revoluble inner casing is revolubly supported, for supporting said inner casing revolubly within said outer casing, rotary drive means in operative relation to said revoluble inner casing, for revolving the latter, fine material interceptor means in operative relation to said revoluble inner casing and across said passage, for cleaning from such current finematerial floating in said passage, said revoluble inner casing and said cleaning means the one vertically movable relatively to the other, and a vertically movable joint between said revoluble inner casing and said cleaning means, for permitting vertical movement between said revoluble inner casing and said cleaning means.

5. Ina pulverizer, an outer casing enclosing an outer chamber, a movably suspended inner casing suspended'movably within and in spaced relation to said outer casing, enclosing a crushing chamber having an upper current outlet and a lower current inlet in communication with said outer chamber and affording up through, out over, down around, and in under, said crushing chamber, an endless current passage, crushing elements in said crushing chamber, for crushing material in said crushing chamber, operator means for operating said elements, supply means for supplying material to be crushed by said elements, distribution means in said crushing chamber and below said supply means, for receiving and distributing such material in said passage, blower means for causing a fluid current to circulate through said passage, and to flow up through, out over and down around, and to return in under, said crushing chamber, to float fine material into said outer chamber, support means for said movably suspended inner casing, above the zone of such distribution and by which said inner casing is movably supported from above such zone, for movably supporting said inner casing from above said zone, and dependent movable suspension means and connected to said movably suspended inner casing, for said movably suspended inner casing, movably mounted on said support means above such zone, and by which said movably suspended inner casing is movably suspended from above such zone, connected to said inner casing, for movably suspending said movably suspended inner casing from above such zone, for movably suspending said movably suspended inner casing from above such zone and within said outer casing.

6. In a pulverizer, an outer casing enclosing an outer chamber, a suspended inner casing suspended within and in spaced relation to said outer casing, enclosing a crushing chamber having an upper current outlet and a lower current inlet in communication with said outer chamber and aifording up through, out over, down around, and in under, said crushing chamber, an endless current passage, crushing elements in said crushing chamber, for crushing material in said crushing chamber, operator means for operating said elements, supply means for supplying material to be crushed by said elements, distribution means in said crushing chamber and below said supply means, for receiving and distributing such material in said passage, support means for said inner casing above the zone of such distribution, for supporting said inner casing from above such zone, revoluble fan blades between said outer casing and said suspended inner casing, and above and concentric of said suspended inner casing, revolving in the space between said casings for causing a fluid current to circulate through said passage and to flow up through, out over and downaround, and to return in under, said suspended chamber, to float fine material from the latter, dependent suspension means for said suspended inner casing, for dependently suspending the latter, mounted on said support means above such zone of distribution, and depended from said support means above such zone past and below said fan blades, and connected to said suspended inner casing below said fan blades, and by which said suspended inner casing is. suspended below said fan blades from above such zone, for suspending said suspended inner casing below said fan blades and from above said zone.

7. In a pulverizer, an outer casing enclosing an outer chamber, a suspended crushing die within and in spaced relation to said outer casing and having an inner annular crushing face disposed around a substantially vertical axis and aflording an upper current outlet and a lower current inlet in communication with said outer chamber and aifording an endless current passage up through, out over, down around, and returning in under, said die, a rotatable crushing roll having a peripheral crushing face within said inner face and for crushing material between said faces, revoluble means for rotating saidroll, supply means for supplying material to be crushed by said faces, distribution means below said supply means and in communication with said passage, for receiving and distributing such material to said faces, support means for said die, above the zone of such distribution and by which said die is vertically supported, for vertically supporting said die from above said zone, blower means for causing a fluid current to circulate through said passage, and to flow up through, out over, and down around, and to return in under, said die, to floatfine material from said die, and dependent die suspension means for said die, carried by said support means above such zone and depended from said support means above such zone, for suspending said die from said support means and from above such zone, and connected to said die and by which said die is vertically suspended, for vertically suspending said die in said outer casing from above such zone, for vertically suspending said die from above such zone.

8. In a pulverizer, an outer casing enclosing an outer chamber, a suspended movable crushing die within and in spaced relation to said outer casing and having an inner annular crushing face disposed around a substantially vertical axis and affording an upper current outlet and a lower current inlet in communication with said outer chamber and affording an endless current passage up through, out over, down around, and returning in under, said die, a rotatable crushing roll having a peripheral crushing face within said inner face and for crushing material between said faces, revoluble means for rotating said roll, supply means for supplying material to be crushed by said faces, distribution means below said supply and in communication with said faces, for receiving and distributing such material to said faces, support means for said movable die, above the zone of such distribution, for supporting said die from above such zone, blower means for causing a fluid current to circulate through said passage, and to flow up through, out over, and down around, and to return in under, said die, to float fine material from said die, and movable dependent suspension means for said movable die, carried by said support means above such zone and depended from said support means from above such zone, for movably dependently suspending said die from above such zone and connected to said movable die, and by which said die is movably suspended from above such zone, for movably suspending from above such zone said die within said outer casing.

9. In a pulverizer, an outer casing enclosing an outer chamber, a suspended crushing die within and in spaced relation to said outer casing and having an inner annular crushing face disposed around a substantially vertical axis and affording an upper current outlet and a lower .current inlet in communication with said outer chamber and affording an endless current passage up through, out over, down around, and returning in under, said die, a rotatable crushing roll having a peripheral crushing face within said inner face and. for crushing material between said faces, revoluble means for rotating said roll, supply means for supplying material to be crushed by said faces, blower means for causing a fluid current to circulate through said passage, and to flow up through, out over, and down around, and to return in under, said die, to float flne material from said die, support means for said suspended die, above said die, for supporting said die from above said die, and dependent suspension means for said die, carried by said support means above said die, and depended from said support means from above, said die, and connected to said die, and by which said die is vertically suspended from above said die, for vertically suspending said die within said outer casing and from above said die.

10. In a pulverizer, an outer casing enclosing an outer chamber, a suspended crushing die within and in spaced relation to said outer casing and having an inner annular crushing face disposed around a substantially vertical axis and aflording an upper current outlet and a lower current inlet in communication with said outer chamber and affording an endless current pasll sage up through, out over, down around, and returning in under, said die, a rotatable crushing roll having a peripheral crushing face within said inner face and for crushing material between said faces, revoluble means for rotating said roll,

8. supply means for supplying material to be crushed by said faces, distribution means below said supply and in communication with said faces for receiving and distributing such material to said faces, support means for said susll pended die, above said suspended die for supporting said die from above said die, blower means for causing a fluid current to circulate through said passage, and to flow up through, out over, and down around, and to return in under, said die, to float flne material from said die, tine material interceptor means concentric of said die and across said passage for cleaning fine material from such'current returning to said die, revoluble fan blades above and concentric of said die and between said outer casing and said suspended die, revolvingin said passage for causing a fluid current to circulate through said passage and flow up through, and out over, and down around, and to return in under, said die, a and dependent die suspension means for said suspended die, carried by said support means above said die and depended from said support means from above said die, for dependently suspending said suspended die from said support means and fromabove said die, and connected to said suspended die, and by which said die is suspended. for suspending said die from above said die in spaced relation to said outer casing and in juxta-position to said blades.

11. In a pulverizer, an outer casing enclosing an outer chamber, a suspended revoluble crushing die within and in spaced relation to said casing and having an inner annular crushing face disposedaround a substantially vertical axis 5 and affording an-upper current outlet and a lower-current inlet in communication with said outer chamber and affording an endless current passage upthrough, out over, down around, and a return current passage in under, said die, a rotatable crushing roll having a peripheral crushing face within and acting toward said face to crush material between said faces, supply means for supplying material to be crushed by said faces, drive means for revolving said die, blower means for causing a fluid current to circulate through said passage, and to flow up through, out over, and down around, and to return in under, said die, to float fine material from said die, support means for said suspended revoluble die, above said die, for supporting said die from above said die, and revoluble dependent suspension means for said suspended revoluble die, revolubly carried by said support means above said die and depended from said support means from above said die, and connected to said die, and by which said die is revolubly suspended from above said die, for revolubly suspending said die from above said die.

12. In a pulverizer, an outer casing enclosing an outer chamber, a suspended revoluble crushing die within and in spaced relation to said casing and having an inner annular crushing face disposed around a substantially vertical axis and affording an upper current outlet and a lower current inlet in communication with said outer chamber and affording an endless current passage up through, out over, down around, and a return current passage in under, said die, a rotatable crushing roll having a peripheral crushing face within and acting toward said face to crush material between said faces, supply means for supplying material. to be crushed by said faces, drive means for revolving said die, blower means for oausinga fluid current to circulate through said passage, and to flow up through, out over, and down around, and to return in under, said die, to float fine material from said die, flne material interceptor means across said passage and in juxtaposition to said die for clean ing fine material from such current flowing through said passage around said die, support means for said suspended revoluble die, above said die, for supporting said die from above said die, and rotary dependent die suspension means for said suspended revoluble die, revolubly carried by said support means above said die and depended from said support means from above said die, and connected to said die and by which said die is suspended revolubly from above said die, for, revolubly suspending said suspended 120 revoluble die from above said die in juxtaposition relatively to said cleaning means.

13. In apulverizer, an outer casing enclosing an outer chamber, a, suspended revoluble crushing die within and in spaced relation to said casing and having an inner annular crushing face disposed around a substantially vertical axis and affording an upper current outlet and a lower current inlet in communication with said outer chamber and affording an endless current passage up through, out over, down around, and a return current passage in under, said die, a rotatable crushing roll having a peripheral crushing face within and acting toward said face to crush material between said faces, supply means for supplying material to be crushed by said faces, drive means for revolving said die, blower means for causing a fluid current to circulate through said passage, and to flow up through, out over, and down around, and to return in under, said 140 die, to float flne material from said die, flne material interceptor means concentric of said die and across said passage for cleaning flne material from such current flowing around said die, support means for saiddie, concentric of said 145 cleaning means, above said die, for supporting said die from above said die and concentrically of said cleaning means, and rotary dependent die suspension means for said suspended revoluble die, revolubly carried by said support means 150 above said die, and concentrically of said cleaning means,. and depended from said support means from above said die and concentrically of said cleaning means, for revolubly suspending said die from said support means and from above said die, and from concentrically of said cleaning means, and connected to said die and by which said die is revolubly suspended, for revolubly suspending said die within said outer casing and from above said die and concentrically of said cleaning means.

14. In a pulverizer, an outer casing enclosing an outer chamber, a suspended revoluble crushing die within and in spaced relation to said casing and having an inner annular crushing face disposed around a substantially vertical axis and affording an upper current outlet and a lower current inlet in communication with said outer chamber and affording an endless current passage up through, out over, down around, and a return current passage in under, said die, a rotatable crushing roll having a peripheral crushing face within and acting toward said face to crush material between said faces, supply means for supplying material to be crushed by said faces,

drive means for revolving said die, blower means for causing a fluid current to circulate through said passage, and to flow up through, out over, and down around, and to return in under, said die, to float fine material from said die, comprising revoluble fan blades between said outer casing and said revoluble die, and concentric of said die and revolving in said passage for causing a fluid current to circulate through said passage, and to flow up through, out over, and down around, said die, and to return in under said die, to float fine material from said die, support means for said die above said die, and concentrically of said blades, for supporting said die from above said die and concentrically of said blades, and revoluble dependent die suspension means for said suspended revoluble die, revolubly carried by said support means above said die and concentrically of said blades and depended from said support means from above said die and concentrically of said blades, and connected to said suspended revoluble die and by which said die is revolubly suspended from above said die and concentrically of said blades, for revolubly suspending said die within said outer casing and from above said die and from concentrically of said blades.

15. In a pulverizer, an outer casing enclosing an outer chamber, a revoluble crushing die within and in spaced relation to said outer casing and having an annular inner crushing face disposed around asubstantially vertical axis a rotatable crushing roll having a peripheral crushing face within and acting toward said face for crushing material between said faces, drive means for said die, above said die, for revolving said die from above said die, supply means for supplying material to be crushedby said faces, discharge means for discharging fine material from said die, and rotary drive connection means for said die, between and in operative relation to said drive means and said die, for driving said die from said drive means, extended below said drive means and extended above and drivingly connected to said revoluble die for revolving said die within said outer casing and from above said revoluble die.

16. In a pulverizer, an outer casing enclosing an outer chamber, a and in spaced relation to said outer casing and having an annular inner crushing face disposed around a substantially vertical axis and affordrevoluble crushing die within ing an upper current outlet and a lower current inlet affording an endless current passage up through, out over, down around, and returning in under, said die, a rotatable crushing roll having a peripheral crushing face within and acting toward said face for crushing material between said faces, drive means for revolving said die, supply means for supplying material to be crushed by said faces, blower means for causing a fluid current to circulate through said passage and to flow up through, out over, and down around said die, and to return in under, said die, to float fine material from said die and tubular dependwhich said die is revolubly suspended for revolubly suspending said die around said supply means.

17. In a pulverizer, an outer casing enclosing an outer chamber, a revoluble crushing die within and in spaced relation to said outer casing and having an annular inner crushing face disposed around a substantially vertical axis and affording an upper current outlet and a lower current inlet affording an endless current passage up through, out over, down around, and returning in under, said die, a rotatable crushing roll having a peripheral crushing face within and acting toward said face for crushing material between said faces, drive means for revolving said die, supply means for supplying material to be crushed by said faces, blower means for causing a fluid current to circulate through said passaid suspension means for revolving said blower without said suspension means above said die.

18. In a pulverizer, an outer casing enclosing an outer chamber, a revoluble crushing die within and in spaced relation to said outer casing and having an annular inner crushing face disposed about a substantially vertical axis and affording an upper current outlet and a lower current inlet communicating with said outer chamber and affording an endless current passage up through, out over and down around, and returning in under, said die, a revoluble and rotatable crushing roll having a peripheral crushing face within and acting toward said face to crush material between said faces, supply means for supplying material to be crushed by said faces, blower means for causing a fluid current to circulate through said passage and to flow up through, out over, and down around, said die, and to return in under, said die, to float fine material from said die, and concentric rotatable drive means, one within and concentric of and encircled by the other, above and for revolving respectively.

19. In a pulverizer, an outer casing enclosing an outer chamber, a revoluble crushing die within and in spaced relation to said outer casing and having an annular inner crushing face disposed about a vertical axis and affording an upper current outlet and a lower current inlet communicating with said outer chamber and affording an endless current passage up through, out over, and down around, and returning in under, said die, a revoluble and rotatable crushing roll having a peripheral crushing face within and acting toward said face to crush'material between said said die and roll" faces, supply means for supplying material to be crushed by said faces, blower means for causing a fluid current to circulate through said passage and to flow up through, out over and down around, said die, and to return in under said die, to float fine material from said die, drive means above and for revolving said die, and tubular drive means around said drive means and above and for revolving said roll.

20. In a pulverizer, an outer casing enclosing an outer chamber, a revoluble crushing die within and in spaced relation to said outer casing and having an annular inner crushing face disposed about a vertical axis and affording an upper current outlet and a lower current inlet communicating with said outer chamber and afl'ording an endless current passage up through, out over, and down around, and returning in under, said die, a revoluble and rotatable crushing roll having a peripheral crushing face within and acting toward said face to crush material between said faces, supply means for supplying material to be crushed by said faces, blower means for causing a fluid current to circulate through said passage and to flow up through, out over, and down around, said die, and to return in under said die, to float fine material from said die, a tubular supply conduit above and concentric of said die, drive means for revolving said roll, and tubular drive means around said conduit and above said die for revolving said die.

GEORGE HOLT FRASER. 

